我正在学习vc++,并使用代码检查内存的使用信息。该程序给了我三个无法解决的外部错误。
error LNK2019: unresolved external symbol _GetProcessMemoryInfo@12 referenced
in function "void __cdecl PrintMemoryInfo(unsigned long)"
(?PrintMemoryInfo@@YAXK@Z)
error LNK2019: unresolved external symbol _EnumProcesses@12 referenced in
function _main
error LNK1120: 2 unresolved externals.
代码::
#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
#include <psapi.h>
// To ensure correct resolution of symbols, add Psapi.lib to TARGETLIBS
// and compile with -DPSAPI_VERSION=1
void PrintMemoryInfo( DWORD processID )
{
HANDLE hProcess;
PROCESS_MEMORY_COUNTERS pmc;
// Print the process identifier.
printf( "\nProcess ID: %u\n", processID );
// Print information about the memory usage of the process.
hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
PROCESS_VM_READ,
FALSE, processID );
if (NULL == hProcess)
return;
if ( GetProcessMemoryInfo( hProcess, &pmc, sizeof(pmc)) )
{
printf( "\tPageFaultCount: 0x%08X\n", pmc.PageFaultCount );
printf( "\tPeakWorkingSetSize: 0x%08X\n",
pmc.PeakWorkingSetSize );
printf( "\tWorkingSetSize: 0x%08X\n", pmc.WorkingSetSize );
printf( "\tQuotaPeakPagedPoolUsage: 0x%08X\n",
pmc.QuotaPeakPagedPoolUsage );
printf( "\tQuotaPagedPoolUsage: 0x%08X\n",
pmc.QuotaPagedPoolUsage );
printf( "\tQuotaPeakNonPagedPoolUsage: 0x%08X\n",
pmc.QuotaPeakNonPagedPoolUsage );
printf( "\tQuotaNonPagedPoolUsage: 0x%08X\n",
pmc.QuotaNonPagedPoolUsage );
printf( "\tPagefileUsage: 0x%08X\n", pmc.PagefileUsage );
printf( "\tPeakPagefileUsage: 0x%08X\n",
pmc.PeakPagefileUsage );
}
CloseHandle( hProcess );
}
int main(void)
{
// Get the list of process identifiers.
DWORD aProcesses[1024], cbNeeded, cProcesses;
unsigned int i;
if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) )
{
return 1;
}
// Calculate how many process identifiers were returned.
cProcesses = cbNeeded / sizeof(DWORD);
// Print the memory usage for each process
for ( i = 0; i < cProcesses; i++ )
{
PrintMemoryInfo( aProcesses[i] );
}
return 0;
}
最佳答案
声明函数的头文件由编译器用来编译代码。但是,链接器确实需要定义所使用的外部功能。通常在导入库中提供。错误消息告诉您链接器没有这样的定义。
您必须包括psapi.h
文件的相应库。
#pragma comment( lib, "psapi.lib" )
编辑::
从MSDN-Remarks Section,
额外的::
#pragma comment
是一个编译器指令,指示Visual C++在生成的目标文件中保留注释。然后,链接程序在处理目标文件时可以读取该注释。#pragma comment(lib, libname)
告诉链接器将“libname”库添加到库依赖项列表中,就好像您已在Linker->Input->Additional dependencies
的项目属性中添加了它一样在MSDN上查看#pragma comment